<?xml version="1.0" encoding="UTF-8"?>
<dxl:DXLMessage xmlns:dxl="http://greenplum.com/dxl/2010/12/">
  <dxl:Comment><![CDATA[
         Objective: To check if redistribute motion is present in between the two "aggregates " nodes when
         group-by is on gp_segment_id;

         create table t(a int, b int, c int) distributed by (a);
         insert into t select 1, i, i from generate_series(1, 10)i;
         insert into t select 1, i, i from generate_series(1, 10)i;
         insert into t select 1, i, i from generate_series(1, 10)i;
         insert into t select 1, i, i from generate_series(1, 10)i;
         analyze t;

         set optimizer_force_multistage_agg to on;

         explain select count(distinct(b)), gp_segment_id from t group by gp_segment_id;

                                                          QUERY PLAN
            -------------------------------------------------------------------------------------------------------------------------------
             Gather Motion 3:1  (slice3; segments: 3)  (cost=0.00..431.00 rows=3 width=12)
               ->  GroupAggregate  (cost=0.00..431.00 rows=1 width=12)
                     Group Key: gp_segment_id
                     ->  Sort  (cost=0.00..431.00 rows=1 width=12)
                           Sort Key: gp_segment_id
                           ->  Redistribute Motion 3:3  (slice2; segments: 3)  (cost=0.00..431.00 rows=1 width=12)
                                 Hash Key: gp_segment_id
                                 ->  Result  (cost=0.00..431.00 rows=1 width=12)
                                       ->  GroupAggregate  (cost=0.00..431.00 rows=1 width=12)
                                             Group Key: gp_segment_id
                                             ->  Sort  (cost=0.00..431.00 rows=14 width=8)
                                                   Sort Key: gp_segment_id, b
                                                   ->  Redistribute Motion 3:3  (slice1; segments: 3)  (cost=0.00..431.00 rows=14 width=8)
                                                         Hash Key: b
                                                         ->  Seq Scan on t  (cost=0.00..431.00 rows=14 width=8)
             Optimizer: Pivotal Optimizer (GPORCA)
            (16 rows
  ]]>
  </dxl:Comment>
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</dxl:DXLMessage>
